package com.pin.zheng.xingmulibrary.util;

import android.util.Base64;

import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

public class DesUtil {
    public static final String KEY = "SqqjlWE7";
    public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
    /**
     * MD5加密算法
     * @param string
     * @return
     */
    public static String md5(String string) {
        byte[] hash;
        try {
            hash = MessageDigest.getInstance("MD5").digest(
                    string.getBytes("UTF-8"));
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("Huh, MD5 should be supported?", e);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("Huh, UTF-8 should be supported?", e);
        }

        StringBuilder hex = new StringBuilder(hash.length * 2);
        for (byte b : hash) {
            if ((b & 0xFF) < 0x10)
                hex.append("0");
            hex.append(Integer.toHexString(b & 0xFF));
        }
        return hex.toString();
    }
    /**
     * 加密
     * @param data
     * @return
     */
    public static String encode(String data) {
        try {
            return encode(KEY, data);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }
    /**
     * 解密
     * @param data
     * @return
     */
    public static String decode(String data) {
        return decodeValue(KEY, data);
    }

//	/**
//	 * DES算法，加密
//	 *
//	 * @param data
//	 *            待加密字符串
//	 * @param key
//	 *            加密私钥，长度不能够小于8位
//	 * @return 加密后的字节数组，一般结合Base64编码使用
//	 * @throws InvalidAlgorithmParameterException
//	 * @throws Exception
//	 */
//	public static String encode(String key, String data) {
//		if (data == null)
//			return null;
//		try {
//			DESKeySpec dks = new DESKeySpec(key.getBytes());
//			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//			// key的长度不能够小于8位字节
//			Key secretKey = keyFactory.generateSecret(dks);
//			Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
//			IvParameterSpec iv = new IvParameterSpec(key.getBytes());
//			AlgorithmParameterSpec paramSpec = iv;
//			cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
//			byte[] bytes = cipher.doFinal(data.getBytes());
//			return byte2hex(bytes);
//		} catch (Exception e) {
//			e.printStackTrace();
//			return data;
//		}
//	}
//
//	/**
//	 * DES算法，解密
//	 *
//	 * @param data
//	 *            待解密字符串
//	 * @param key
//	 *            解密私钥，长度不能够小于8位
//	 * @return 解密后的字节数组
//	 * @throws Exception
//	 *             异常
//	 */
//	public static String decode(String key, String data) {
//		if (data == null)
//			return null;
//		try {
//			DESKeySpec dks = new DESKeySpec(key.getBytes());
//			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//			// key的长度不能够小于8位字节
//			Key secretKey = keyFactory.generateSecret(dks);
//			Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
//			IvParameterSpec iv = new IvParameterSpec(key.getBytes());
//			AlgorithmParameterSpec paramSpec = iv;
//			cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
//			return new String(cipher.doFinal(hex2byte(data.getBytes())));
//		} catch (Exception e) {
//			e.printStackTrace();
//			return data;
//		}
//	}
//
//	/**
//	 * 二行制转字符串
//	 *
//	 * @param b
//	 * @return
//	 */
//	private static String byte2hex(byte[] b) {
//		StringBuilder hs = new StringBuilder();
//		String stmp;
//		for (int n = 0; b != null && n < b.length; n++) {
//			stmp = Integer.toHexString(b[n] & 0XFF);
//			if (stmp.length() == 1)
//				hs.append('0');
//			hs.append(stmp);
//		}
//		return hs.toString().toUpperCase(Locale.getDefault());
//	}
//
//	private static byte[] hex2byte(byte[] b) {
//		if ((b.length % 2) != 0)
//			throw new IllegalArgumentException();
//		byte[] b2 = new byte[b.length / 2];
//		for (int n = 0; n < b.length; n += 2) {
//			String item = new String(b, n, 2);
//			b2[n / 2] = (byte) Integer.parseInt(item, 16);
//		}
//		return b2;
//	}


    /**
     * DES算法，加密
     *
     * @param data
     *            待加密字符串
     * @param key
     *            加密私钥，长度不能够小于8位
     * @return 加密后的字节数组，一般结合Base64编码使用
     * @throws
     *
     */
    public static String encode(String key, String data) throws Exception {
        return encode(key, data.getBytes());
    }

    /**
     * DES算法，加密
     *
     * @param data
     *            待加密字符串
     * @param key
     *            加密私钥，长度不能够小于8位
     * @return 加密后的字节数组，一般结合Base64编码使用
     * @throws
     *
     */
    public static String encode(String key, byte[] data) throws Exception {
        try {
            DESKeySpec dks = new DESKeySpec(key.getBytes());

            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            // key的长度不能够小于8位字节
            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes());
            AlgorithmParameterSpec paramSpec = iv;
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);

            byte[] bytes = cipher.doFinal(data);

            return Base64.encodeToString(bytes, Base64.DEFAULT);
        } catch (Exception e) {
            throw new Exception(e);
        }
    }

    /**
     * DES算法，解密
     *
     * @param data
     *            待解密字符串
     * @param key
     *            解密私钥，长度不能够小于8位
     * @return 解密后的字节数组
     * @throws Exception
     *             异常
     */
    public static byte[] decode(String key, byte[] data) throws Exception {
        try {
            SecureRandom sr = new SecureRandom();
            DESKeySpec dks = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            // key的长度不能够小于8位字节
            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes());
            AlgorithmParameterSpec paramSpec = iv;
            cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
            return cipher.doFinal(data);
        } catch (Exception e) {
            throw new Exception(e);
        }
    }

    /**
     * 获取编码后的值
     *
     * @param key
     * @param data
     * @return
     * @throws Exception
     */
    public static String decodeValue(String key, String data) {
        byte[] datas;
        String value = null;
        try {
            if (System.getProperty("os.name") != null
                    && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System
                    .getProperty("os.name").equalsIgnoreCase("linux"))) {
                datas = decode(key, Base64.decode(data, Base64.DEFAULT));
            } else {
                datas = decode(key, Base64.decode(data, Base64.DEFAULT));
            }

            value = new String(datas);
        } catch (Exception e) {
            value = "";
        }
        return value;
    }
}
